John a



- waited gm@ @anni @Hire JOHN A. HAAsE, or PHILADELPHIA, PENNSYLVANIA.Leners Parent No. 89,577, amd .May 4, 1869. 5

IDEPROVEBEENT IN LOORm.

The semaine misma to'm um Lem:- Psn: ma making'pm o! uw um.

To all whom it may concern:

Be it known that I, J oHN A. HAAsE, of thecity and county ofPhiladelphia, and State of Pennsylvania, have invented a new and usefulImprovement in Floor- Olamps; and, do heleby declare that the followingis a full and exact description thereof, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

The nature o f my invention mainly consists of re* taining-jaws, whichare confined to one of the joists on which theoor is to be laid, and aforcing-screw and clamping-head on a sliding bar, the said screw andshaft working in one of the jaws, and the'several parts beingconstructed and arranged as follows:

' In the accompanying drawings, which make a part Vof thisspecification- A and A' are retaining-jaws, which are provided.

withxhorizontal screws B B, by means of which they are fastened to oneof the joists.

The said jaws have their faces checkered with teeth, as seen in tigs. 1,2, and 3, so as to prevent their slipping on the joists. a 4

The jaw A has a horizontal supporting-shoulder a' and a", which restson` the joist and gives great stability to the saidrjaw A in preventingits turning during the clamping of the boards. y

The part a" is projected from the contiguousedg of the jaw A, and isstrengthened by meansof the bracket b.

The jaw A has a slotted elbow, d, which 'guides the lug s of the jaw A'to preserve the parallelism of the jaws and prevent torsional strain ofthe screws B B.

day of February, 1868.

C is the forcing-shalt, which turns'iu a nut in the jaw A, its tai1-endbearing against the inner side of the clamping-head D, forcing itagainst the `outer edge of the contiguous board, to be clamped, as saidshaft is screwed forward by means of the handle E, the shaft F of thehead sliding in the hole c, through the jaw A.

When desired, vthe forcing-shaft C may have a smooth periphery, ahd beoperated by means of a cam or lever.y

It' will readily appear that the retaining-jaws being teethed to preventslipping on the joist, and the standing jaws A having a support whichrests upon thetop of the joist, that great stability is given to saidjaws; and that as the clamping-head heilig permanent to its shaft, whichhas a bearing-surfacethrough the whole width of the jaw A, that it mustbe moved without the tendency to spring from its normal position, as inother door-clamps.

What I claim as new, and desire to secure by Letters Patent, is-

1. The construction of the jaw A with a supporting-shoulder, a al',substantially in the manner described, and furthe purpose set forth.

2. The construction of the jaws A and A' with the slotted elbow d andlng e, substantially as described and for the purpose specified.

3. A, floor-clamp, composed of the retaining-jaws A and Af,retaining-screws B B, clamping-head D, guiding and supporting-shaft F,and forcing-shaft 0, when the several parts are constructed and arrangedfor joint operation, substantially iu the manner and for the purpose setforth.

In testimony that the above is my invention, I have hereunto set my handand affixed niy seal, this 25th JOHN A. HAASE. [1.. s.]

Witnesses: Y

STEPHEN Us'rlcx, J onN Wm'rn.

